Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
Rank Math takes the schema data from your product pages automatically and turns it into Schema-ready content. Likewise, the aggregateRating and review fields are taken from your actual product reviews that your buyers/customers leave on your products.

If you don’t have any reviews yet, that is going to show up as a warning in the schema testing tool. That’s because Google will actually look for those fields.
Please acquire some reviews and ratings to get rid of the aggregateRating and review warnings.
To fix the brand warning, head over to WordPress Dashboard > Rank Math > General Settings > WooCommerce and choose from any of the available fields to use as your product’s brands.

If you want to use a custom value for your Brands, you can do that by using the following code in your theme’s functions.php file:
// Add Brand for Products.
add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
$entity['brand'] = 'Rank Math';
return $entity;
});
Replace the “Rank Math” text with your actual brand name then run your website through the Google’s Rich Results testonce again.
With Rank Math PRO, you can fix the warning No global identifier provided by filling out these details. Here’s the link for your reference:
https://rankmath.com/kb/gtin-mpn-woocommerce/
However, please note that these are just warnings and optional values for the Product Schema.
In Google Images search results, my images have the “licensable” tag but not the “product” tag.
Could you please share the product URL so we can also check and advise accordingly?
I hope that helps.
Thank you, and looking forward to helping you.